RS Regulate AKM Accessory Mount, Picatinny, Fits .66 Barrel Diameter, Matte Finish, Black BM-2 The BM-s Accessory Mount allows the end user to be able to mount their preferred forward accessories to their AK47/Yugo spec barrel. With a .66" Diameter" this accessory mount will allow the use of any attachment that accepts picatinny style mounting. Weighing in at just 0.8oz" this mount will completely change how you see this classis firearm of the past.